What are Docker layers? 

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In Docker, layers are an important feature of building and managing container images. Each Docker image is composed of layers, each representing a modification of the base image.
When you create a Docker image, each command in your Dockerfile creates a new layer. For example, if you use the "RUN" command to install a library into your image, it will create a new layer that contains that library.
Layers are stored on disk as tar files and are organised as a linear chain. When you run a container from an image, Docker assembles the layers of the image to create a read-only file system that is mounted read-write for the container.
The layers are also designed to be reusable, which means that multiple images can share common layers. For example, if you have two images that are based on the same base image and have common layers for installing libraries, these layers will only be stored once on disk.
This makes image storage more efficient and saves disk space. Layers can also be cached to speed up image building and container creation.
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